I have always wondered about the use of aluminium in the Philippines being used as a measurement of possible age. Quite a few threads here on the forum point to WWII as the starting point, but I know the US Army was using aluminium for the making of their canteens during the Spanish American War. I wonder how many other items that they used were made of this material as well? This could point to items like this having possibly being made much earlier than the WWII date we have been using when discussing these items.